I have got finally a way to improve Domain Authority of a website, sharing with you now.

Mainly it is based on your website's link profile, how many inbound links are pointing to your website. So we should focus to gain more and more good links and disavow the bad links through the webmaster tools. that's it.

Domain authority is the measure of strength and popularity of your domain in search engines. It is measured by Moz and your domain is ranked between 0 to100 depending on the popularity and trust. DA can be improved by good content update and also by building backlinks from other relevant domains.